#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,i,j,t,a[79][79]={0};
	cin>>n;
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			t=n-i-1;
			if(t==j||i==j){
				a[i][j]=1;
			}
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			if(a[i][j]==1){
				cout<<"X";
			}else{
				cout<<" "; 
			} 
		}
		cout<<endl;
	}
	return 0;
}

/**************************************************************
	Problem: 1239
	User: zzz
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/